Notgeld, or emergency money is the term applied to coins like this one. During World War I rampant inflation overtook Germany and there were severe coin shortages. To support commerce, individual cities and towns issued money, like this piece from Aachen.
We have a page [Click Here] about notgeld in general. They are avidly collected today.
This piece is rather common. Typical catalog values are:
worn: $1 US dollar approximate catalog value
average circulated: $3
well preserved: $10
fully uncirculated: $45
Use our Important Terminology page to interpret catalog values.